With the ever increasing costs of electricity it is the most expensive furnace to operate on this list. The typical price to replace an electric furnace ranges from $1,000 to $1,500. These furnaces can last about 25 to 30 years and the efficiency ranges between 80 to 90 percent. The heat pump is one of the newest and most efficient designs of furnace, as they operate as both a furnace and air conditioner.
Adult Teeth. Adults have more teeth than children; most adults have 32 teeth. Among these teeth are 8 incisors, 4 canines, 8 premolars, and 12 molars (including 4 wisdom teeth). Most people have a complete set of adult teeth by the time they reach their teenage years.
At around four months of age -- and it can vary from breed to breed and even from dog to dog -- the 28 puppy teeth are replaced with 42 adult canine teeth, which include the molars. You will see six incisors on the top and bottom (these are the smaller front teeth located between the large fang-like canines).